The bug can be reproduced using mainline kernel version 4.1-rc2 installed from http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.1-rc2-vivid/
The bug can be reproduced using mainline kernel version 4.1-rc2 installed from http:// kernel. ubuntu. com/~kernel- ppa/mainline/ v4.1-rc2- vivid/